I don't know if it is still available or not... However... If you really want to do the trick let me know. I have several sets of the silk bits, and you can get the "Rice Palmo" gimmicks (I think they are the best) from www.stevensmagic.com
Matter of fact, when McComb lost (stolen?) his set I supplied him with a couple of extra sets of the silks. (Gad I hate that term) Maybe I should say "silk handkerchiefs" ???
Anyway, if you have the Rice Enclyclopedia set of books on Silk Magic -- you will find a very early version creditied to Loyd Enochs, where a smaller part of the handkerchief "does not dye" -- and this I had looooooooooong before I learned the 1/2-Dyed from Billy... And I still use the original Enoch's dye tube along with the Palmo. I find that having two different shape gimmicks makes it easier to recognize one from the other.